Does the new adhesive Synthetic polypropylene underlayment totally take to place of using the ole asphalt-felt underlayment??

Is it becoming standard practice to totally cover the entire roof exclusively with the synthetic underlayment? I realize that it's much more costly to install the adhesivde synthetic underlayment, but it seems to be a MUCH better underlayment for the long run.

I noticed that the Synthetic underlayments don't have the horizontal guide-strips that the felt paper has...is that correct?

Thanks.